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(e) Thermal environment—( l ) Performance requirement. The dwelling unit must have and be capable of maintaining a thermal environment healthy for the human body. (2) Acceptability criteria. (i) There must be a safe system for heating the dwelling unit (and a safe cooling system, where present) . The system must be in proper operating condition . The system must be able to provide adequate heat (and cooling, if applicable), either directly or indirectly, to each room, in order to assure a healthy living environment appropriate to the climate . (ii) The dwelling unit must not contain unvented room heaters that bum gas, oil , or kerosene . Electric heaters are acceptable . (f) Illumination and electricity—( 1 ) Performance requirement. Each room must have adequate natural or artificial illumination to permit normal indoor activities and to support the health and safety of occupants. The dwelling unit must have sufficient electrical sources so occupants can use essential electrical appliances. The electrical fixtures and wiring must ensure safety from fire . (2) Acceptability criteria. (i) There must be at least one window in the living room and in each sleeping room . (ii) The kitchen area and the bathroom must have a permanent ceiling or wall light fixture in proper operating condition . The kitchen area must also have at least one electrical outlet in proper operating condition. (iii) The living room and each bedroom must have at least two electrical outlets in proper operating condition. Permanent overhead or wall -mounted light fixtures may count as one of the required electrical outlets. (g) Structure and materials—( 1 ) Performance requirement. The dwelling unit must be structurally sound . The structure must not present any threat to the health and safety of the occupants and must protect the occupants from the environment. (2) Acceptability criteria. (i) Ceilings, walls, and floors must not have any serious defects such as severe bulging or leaning, large holes, loose surface materials , severe buckling, missing parts, or other serious damage . (ii) The roof must be structurally sound and weathertight. (iii) The exterior wall structure and surface must not have any serious defects such as serious leaning, buckling, sagging, large holes , or defects that may result in air infiltration or vermin infestation . (iv) The condition and equipment of interior and exterior stairs, halls, porches, walkways, etc . , must not present a danger of tripping and falling . For example, broken or missing steps or loose boards are unacceptable .